Thanks Luca,
Those are some interesting links that I've skimmed through before, I think, and I'll be studying in a little more detail now that my interest is a little more peaked. I've got a lot of respect for X1/Xarax's contributions, but I find some of his creations get a little too loopy (literally) for my fumbling fingers to manipulate.
I lovvve knots that fall apart when it comes time to unravel them (ie, like a carrick bend/loop, or a zeppelin bend), without have to resort to a slipped section that could get caught and explode the knot.
The only reason I pursued this TIB Zeppelin loop was because if one did exist, I believe it would probably be even easier to untie than a fireman's chair knot, after being heavily strained.
The double dragon seemed promising, it beats a single loop alpine butterfly, but not the locked slipped loop, imo. So the never ending search for improvement continues.